This thing still works great after being abused, left in the rain, etc for over two years. Propane is expensive, so we refill the little 1 lb cans from a big 15 lb tank. It automatically turns itself off if it gets tipped over or tilted, and we have CO detector. One of us usually just holds it in our hands till we get toasty, then turn if off and go to sleep. We love it.
The smallest little buddy heater would probably be sufficient:
This this the smallest system I would start with. It’s a much better battery and inverter. this battery is >5kw compared to <1kw for the one you’re looking at. With enough panels you’re fine for what you need, but keep in mind that 1 kw heater would only last ~ 5 hours here at full charge with nothing else running.
Electric heat is just not efficient at all. Buy a small propane camp heater like this.
The rest is doable and power tools would run off the above system if you’re using them intermittently. You could also expand this for some lv 1 EV charging but you’d want to double the battery capacity and mount as many panels as the system would accept. But down the road it’s adaptable for that purpose